Note 2. Long-Term Incentive Plans (Detail) - Share-based Compensation Allocation (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Allocated Share-Based Compensation	$ 240,000	$ 235,000	$ 719,000	$ 753,000
Cost of Sales [Member]
Allocated Share-Based Compensation	19,000	24,000	57,000	76,000
Research and Development Expense [Member]
Allocated Share-Based Compensation	82,000	84,000	247,000	270,000
Selling, General and Administrative Expenses [Member]
Allocated Share-Based Compensation	$ 139,000	$ 127,000	$ 415,000	$ 407,000

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration